Short Answer

In response to a question (that may include a image), the respondent
types a word or phrase. There may several possible correct answers,
with different grades. Answers may or may not be sensitive to case.

Numerical

From the student perspective, a numerical question looks just
like a short-answer question.
The difference is that numerical answers are allowed
to have an accepted error. This allows a continuous range of answers
to be set.

Random

Description

This is not a real question. It simply prints some text (and possibly graphics)
without requiring an answer. This can be used to provide some information to
be used by a following group of questions, for example.